#26.Use the following information to answer the next question.
Bacteriophages are viruses that infect bacteria. Depending on the bacteriophage, their genome can be made of either single or double stranded DNA or RNA.
The composition of genetic material found in a bacteriophage is found to be 25% A, 33% T, 24% G, and 18% C. What can you conclude about the genetic material of this virus?
Select one:
a. It is single-stranded DNA.
b. It is double-stranded DNA.
c. It is single-stranded RNA.
d. It is double-stranded RNA.
#27.Use the following information to answer the next question.
Several different nucleic acids are involved in the process of getting a protein produced from a gene. DNA contains the “genetic code” for the protein. DNA is double-stranded, but only one strand is transcribed into mRNA. The mRNA then goes into the cytoplasm where it is translated into protein with the help of tRNA. At each stage of the process, there is base complementarity (A pairs with T/U and C pairs with G) between the nucleic acids involved to ensure the integrity of the DNA blueprint for the protein being produced. Therefore, some of the four strands of nucleic acids involved will match (except U replaces T in RNA) and some will have base complementarity.
Indicate whether there is matching (1) or base complementarity (2) between the following nucleic acids.
DNA sense strand and mRNA
DNA sense strand and tRNA
DNA antisense strand and mRNA
mRNA and tRNA
#28.Both DNA and RNA are long chains of nucleotides. Nucleotides are made up of a phosphate group, a nitrogen base, and a five-carbon sugar. The carbons in the sugar (deoxyribose in DNA and ribose in RNA) are numbered 1′ to 5′. The nitrogen base is on the 1′ carbon, the phosphate is on the 5′ carbon, and there is a hydroxyl group on the 3′ carbon of a nucleotide.
When nucleotides are joined together, the hydroxyl group is replaced by the phosphate from the 5′ carbon of the second nucleotide. Because of this, nucleic acids have directionality and are either 5′ to 3′ or 3′ to 5′.
Which of the following rows is true regarding transcription and translation?
a). Transcription( mRNA grows 5' to 3') Translation(Ribosomes move 3' to 5' along mRNA). b).Transcription(mRNA grows 3' to 5')Translation(Ribosomes move 3' to 5' along mRNA).c).Translation(mRNA grows 3' to 5')Translation(Ribosomes move 5' to 3' along mRNA).d)Translation(mRNA grows 5' to 3') Translation(Ribosomes move 5' to 3' along mRNA).
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